1.

The half life period for the first order reaction XY_(2) rarr X+Y_(2) is 10 minutes . In what period would the concentration of XY_(2) be reduced to 10% of the original concentration ?

Answer»

33.2 min
90 min
120 min
26.3 min

SOLUTION :(A ) `K = (0.693)/(t_(1//2)) `
`= (0.693)/(10) = 0.0693 min^(-1)`
`t = (2.303 )/(k) "LOG" ([A]_(0))/(0.1[A]_(0))`
`= (2.303)/(0.0693)xx1= 33.2 `


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